Configure convertDeprecationsToExceptions="true" in phpunit.xml.dist (#2992)

.github/workflows/ci.yml

@@ -49,6 +49,9 @@ jobs:
             psr7: '^1.7@dev'
           - php: '7.4'
             psr7: '^2.0@dev'
+        exclude:
+          - php: '8.1'
+            psr7: '^1.7'
 
     steps:
       - name: Set up PHP

phpunit.xml.dist

@@ -7,6 +7,7 @@
            executionOrder="random"
            failOnRisky="true"
            failOnWarning="true"
+           convertDeprecationsToExceptions="true"
   >
   <testsuites>
     <testsuite name="Test Suite">

tests/bootstrap.php

@@ -2,6 +2,7 @@
 
 namespace {
     \setlocale(\LC_ALL, 'C');
+    \error_reporting(\E_ALL);
 }
 
 namespace GuzzleHttp\Test {